j4. Your link shows knifes.. I don't do knifes, when they get that close I whip it at them and run..
I do not know anything about the piston driven ARs..
Interesting demonstration on one of the outdoor channel shows..
Guy placed two ARs on a table in the sun. One standard, other piston driven..
Had a heat gun to test before and after firing a 30 round mag..
Both weapons were about 100 deg. from sitting there..
Be damned if the standard AR did not go up 30 degs after firing and the piston driven actually lost 2 degs after he fired, down too 98 degs..
Now he was measuring the breech AO, not the barrel..
Hell I don't know, he looked like he had college.

"Man needs but two things to survive alone in the woods. A blow up female doll and his trusty old AK-47" - Thomas Jefferson 1781

j4. Your link shows knifes.. I don't do knifes, when they get that close I whip it at them and run..
I do not know anything about the piston driven ARs..
Interesting demonstration on one of the outdoor channel shows..
Guy placed two ARs on a table in the sun. One standard, other piston driven..
Had a heat gun to test before and after firing a 30 round mag..
Both weapons were about 100 deg. from sitting there..
Be damned if the standard AR did not go up 30 degs after firing and the piston driven actually lost 2 degs after he fired, down too 98 degs..
Now he was measuring the breech AO, not the barrel..
Hell I don't know, he looked like he had college.

the sale is over --they still got um though-same price-but you got to pay for shipping and you don't get all those little freebies--now they got knives on the sale page

one of the gripes about the AR/M16s bolt carrier group is that hot gasses are routed through the carrier and out the side of the carrier.

this is a sure way to heat up the bolt and carrier and gunk things up.

now for us sportsmans it don't matter that much cause were not going to be firing ten 100 rd beta mags back to back full auto from the door position of an egg beater.